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Radiata pine wood treatment with a dispersion of aqueous styrene/acrylic acid copolymer

  • Wenbo Che , Zefang Xiao EMAIL logo , Guanghui Han , Zhongguo Zheng and Yanjun Xie ORCID logo EMAIL logo
Published/Copyright: January 6, 2018
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Abstract

Wood of radiata pine (Pinus radiata Don) was treated with an aqueous styrene/acrylic acid (St/AA) copolymer dispersion leading to weight percent gains (WPGs) of 10–42%. The reactivity of St/AA in wood and the modifying effects on wood properties were investigated. The St/AA precipitated in the cell lumens and condensed under catalysis at elevated temperatures was shown via scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Treatment did not cause positive bulking efficiency and anti-swelling efficiency, because St/AA cannot diffuse into the cell walls due to its high molecular mass. The modulus of elasticity and rupture (MOE and MOR, respectively), and the surface hardness of the wood were improved by 24.4, 22.2, and 40.6%, respectively. Compression strength increased by 81.6 and 48.2% in radial and longitudinal directions, but the impact strength was hardly influenced by the treatment. In addition, the treated wood was slightly more hydrophobic than untreated controls as shown by reduced moisture content and water uptake. Accordingly, treatment with St/AA leads to mechanical reinforcement of wood and enhances its water resistance, and as a consequence, it has an application potential to improve the wood quality.

Acknowledgments

The authors are grateful to the support from the National Natural Science Foundation of China (Funder Id: 10.13039/501100001809, Grant Number: 31470585 and 31500469) and Natural Science Foundation of Heilongjiang Province, China (Funder Id: 10.13039/501100005046, Grant Number: JC2015006).

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Received: 2017-9-10
Accepted: 2017-12-4
Published Online: 2018-1-6
Published in Print: 2018-4-25

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